geometryFind the coordiantes of the center and the radius of each circle a. (x+root5)^2 + y^2 -8y =9
April 29, 2012

geometryWrite an equation for each circle if the coordiantes of the center and length of the radius are a. center(-1,-5) radius = 2 units b. center(0,3) radius = 7 units c. center(-9,7) radius = 1/2 units
April 29, 2012

geometrythe diagonal VY of a cuboid =root(26.25)cm, the length of a side ZY = 4cm and the height of a sideUZ =25cm for the cuboid. Find the width of the width UV.
April 24, 2012

geometrya closed box of uniform thickness is made of wood 1cm thick. Its extenal dimensions are 6cm and 5 cm by 4 cm. Find the a. volume of the wood used in making the box. b. the capacity of the box, given that the cover is full length and full width c. The interior surface area if ...
April 24, 2012

trigonometryHal walked from point A to point B due north east from a distance of 20m. He immediately changed direction and walked 50m from B to C on a bearing of 110 degrees. 1. calculate the distance AC 2. Find the bearing of C from A
April 23, 2012

trigonometrytwo pieces of wire stretched from the top, M of a vertical pole to the points L and N on the horizontal ground. the angle of depression of L from N =65 degrees. N is on the opposite side of the pole(from left)at an angle of depression of 72 degrees from M. Find the length of ...
April 23, 2012

trigonometrya ship travels 8km due north then 7km on a bearing of 070 degrees 1. draw a diagram to represent the information 2. calculate the distance and bearing of the ship from its starting point
April 21, 2012

trigonometrygiven triangle ABC with AB=7cm, BC=8cm and AC=9cm calculate 1. the size of the largest angle 2. the area of the triangle
April 21, 2012

calculusI'm trying to find the intersection point of y=x-2 and y=sqrt(x). I tried letting both equations equal each other but kept coming up with the points (4,1) and (1,4) however these aren't right as the answer should be (4,2) but I am unable to get this answer. Help please?
February 23, 2012

PhysicsBy what factor is the resistance of a copper wire changing when its temperature is increased from 20 degrees Celsius to 120 degrees Celsius? The temperature coefficient of resistivity for copper = 3.9 x 10^-3 (C)^-1.
February 5, 2012

geometryTriangles Rst and wxy are similar . the side lengths of rst are 10 inches. 14 inches and 20 inches and the length of an altitude is 6.5 inches. The shortest side of wxy. Find the lengths of the other two sides of wxy. Find the length of the corresponding altitude of wxy.
January 12, 2012

Physics(a) What is the angular speed (rad/s) of the wheel just after the bullet leaves it? (b) How much kinetic energy (J) was lost in the collision?
December 25, 2011

PhysicsA bullet with a mass m = 4:83 g and initial speed of 330 m/s passes through a wheel which is initially at rest as in the The wheel is a solid disk with mass M = 2.29 kg and radius R = 1.:6 cm. The wheel rotates freely about an axis through its center and out of the plane shown...
December 25, 2011

PhysicsA long thin rod of mass M = 2:00 kg and length L = 75:0 cm is free to rotate about its center as shown. Two identical masses (each of mass m = .403 kg) slide without friction along the rod. The two masses begin at the rod's point of rotation when the rod is rotating at 10....
December 24, 2011

physicsIn order to change the angular momentum of an object, it is necessary to apply a. a net force to the object. b. a net torque to the object. c. a centripetal acceleration to the object. d. both a net force and a net torque to the object. We have three vectors, labeled A, B, and...
December 24, 2011

Calculusan (2a-4)=2(a-2) or -2(2-a) which will cancel out your 2-a, then do the same for the 2a+4, and this should give you your answer
December 23, 2011

PhysicsA star with the same mass and diameter as the sun rotates about a central axis with a period of about 29.2 days. Suppose that the sun runs out of nuclear fuel and collapses to form a white dwarf star with a diameter equal to that of the earth. Assume the star acts like a solid...
December 23, 2011

Physics An airplane of mass 2180 kg located 131 km north of U is ying 272 km/hr in an easterly direction. (a) What is the magnitude of the angular momentum (kg m2/s) with respect to U? (b)what is the angular momentum with respect to U?
December 23, 2011

PhysicsCalculate the position of the center of mass of the following pairs of objects. Use a coordinate system where the origin is at the center of the more massive object. Give your answer not in meters but as a fraction of the radius as requested. Get data from inside the front ...
December 15, 2011

chemistryWhen zinc metal is reacted with hydrochloric acid, zinc chloride and hydrogen gas are produced. If 16.4 ml of 2.14 M HCl are used: a) how many grams of zinc metal are needed to completely use up the acid? b) What will be the molarity of the aqueous product? Please show all ...
December 7, 2011

chemistry! URGENTA standard solution is prepared for the analysis of fluoxymesterone (C20H29FO3), an anabolic steroid. A stock solution is first prepared by dissolving 10.0 mg of fluoxymestrone in enough water to give a total volume of 500.0 ml. A 100.0 micro liter aliquot (portion)of this ...
December 7, 2011

physicsOn an air track, a 403.0 glider moving to the right at 2.30 collides elastically with a 501.0 glider moving in the opposite direction at 3.00 .Find the velocity of first glider after the collision
December 4, 2011

physicsa horizontal force of 60.0 N is exerted on a 2.00 kg discuss as it is rotated uniformily in a horizontal circle (at arm's length) at radius of 1.00 m. Calculate the speen of the disuss
November 16, 2011

CalculusThe price per unit is given by the equation p=18-2ln(x). What is the marginal revenue at x=400? And what should the number of units sold be in order to maximize revenue?
November 7, 2011

statisticsA survey was conducted to measure the number of hours per week adults spend on home computers. In the survey, the number of hours was normally distributed, with a mean of 8 hours and a standard deviation of 1 hour. A survey participant is randomly selected. Find the ...
November 7, 2011

chemThe mass of an electron is 9.11\times 10^{-31}~\rm kg. If the de Broglie wavelength for an electron in a hydrogen atom is 3.31\times 10^{-10}~\rm m, how fast is the electron moving relative to the speed of light? The speed of light is 3.00\times10^8 ~\rm m/s.
November 2, 2011

MathIn class we started operation with radicals how would you answer a question like this determine the length of the line segment from A(-2,7), to B (4,1)?
October 20, 2011

OchemA student needed to determine the percent composition of a mixture that contained fluorene and benzoic acid. The student took 283 mg of the mixture and used the extraction method to separate the components. Then both compounds were recrystallized and dried. The experiment ...
October 19, 2011

CRT 205 Can someone review this and let me know if it is acceptable?? This class was so hard and it has been all i can do to pass it! Here is the article i chose Addiction Is a Choice, Not a Disease Addiction , 2009 Content Level = Intermediate Dale Netherton, "It's Not ...
September 17, 2011

PhysicsA quarterback claims that he can throw the football a horizontal distance of 183 m (200 yd). Furthermore, he claims that he can do this by launching the ball at the relatively low angle of 35° above the horizontal. To evaluate his claim, determine the speed with which this...
February 9, 2011

ChemistryAll amino acids (choose the correct choice) a) have the same side chains b) form zwitterions c) have the same isoelectric points d) show hydrophobic tendencies e) are essential amino acids
December 13, 2010

Math- help finishing A right triangle has an area of 84 ftand a hypotenuse 25 ft long. What are the lengths of its two sides? Ive gotten this far: 25^2= a^2+b^2 a=25-b 84= ab/2 168= 25b-b^2 b^2-25b+168=0 I then use the quad. formlua to solve for b... but I get an error. Can someone help me?
December 8, 2010

ChemPlease tell me if these are right? A mixture of oxygen and helium is prepared for a scuba diver that will descend to 125 feet below the ocean surface. At that depth the diver breathes a gas mixture that has a total pressure of 8atm. If the particle pressure of the oxygen in ...
November 29, 2010

ChemA sample of nitrogen (N2) gas has a volume of 250ml at 30 degrees C and a pressure of 745mmHg. What is the volume of the nitrogen at STP? I got 22 liters in significant figures is this right. thank you.
November 24, 2010

ChemistryDraw the condensed structural formula for the products of the acid hydrolysis of the following amide with HCl: CH3-CH2-C(=O)-NH2 + H2O + HCl ---> I'm afraid I don't even know where to begin with this one, help!
November 24, 2010

ChemistryI know that vanillin has the functional groups aldehyde, ether, and phenol. My assigment says there is a fourth. Which one am I missing?
November 24, 2010

chemistrySome information is missing for the question. There needs to be an equation to go along with this. I will give you the general way to do a problem like this, but this is not the answer to your specific problem, you will have to use your given equation to get the correct answer...
September 9, 2010